Initial sound support
git-svn-id: svn://svn.code.sf.net/p/rdesktop/code/trunk/rdesktop@474 423420c4-83ab-492f-b58f-81f9feb106b5
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rdpsnd_oss.c
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176
rdpsnd_oss.c
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/*
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rdesktop: A Remote Desktop Protocol client.
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Sound Channel Process Functions - Open Sound System
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Copyright (C) Matthew Chapman 2003
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Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "rdesktop.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <sys/soundcard.h>
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#define MAX_QUEUE 10
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int g_dsp_fd;
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BOOL g_dsp_busy;
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static struct audio_packet {
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struct stream s;
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uint16 tick;
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uint8 index;
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} packet_queue[MAX_QUEUE];
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static unsigned int queue_hi, queue_lo;
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BOOL
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wave_out_open(void)
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{
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char *dsp_dev = "/dev/dsp";
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if ((g_dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
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{
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perror(dsp_dev);
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return False;
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}
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/* Non-blocking so that user interface is responsive */
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fcntl(g_dsp_fd, F_SETFL, fcntl(g_dsp_fd, F_GETFL)|O_NONBLOCK);
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return True;
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}
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void
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wave_out_close(void)
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{
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close(g_dsp_fd);
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}
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BOOL
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wave_out_format_supported(WAVEFORMATEX *pwfx)
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{
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if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
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return False;
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if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
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return False;
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if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
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return False;
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return True;
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}
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BOOL
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wave_out_set_format(WAVEFORMATEX *pwfx)
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{
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int speed, channels, format;
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ioctl(g_dsp_fd, SNDCTL_DSP_RESET, NULL);
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ioctl(g_dsp_fd, SNDCTL_DSP_SYNC, NULL);
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if (pwfx->wBitsPerSample == 8)
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format = AFMT_U8;
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else if (pwfx->wBitsPerSample == 16)
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format = AFMT_S16_LE;
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if (ioctl(g_dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
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{
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perror("SNDCTL_DSP_SETFMT");
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close(g_dsp_fd);
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return False;
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}
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channels = pwfx->nChannels;
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if (ioctl(g_dsp_fd, SNDCTL_DSP_CHANNELS, &channels) == -1)
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{
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perror("SNDCTL_DSP_CHANNELS");
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close(g_dsp_fd);
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return False;
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}
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speed = pwfx->nSamplesPerSec;
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if (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, &speed) == -1)
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{
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perror("SNDCTL_DSP_SPEED");
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close(g_dsp_fd);
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return False;
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}
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return True;
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}
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void
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wave_out_write(STREAM s, uint16 tick, uint8 index)
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{
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struct audio_packet *packet = &packet_queue[queue_lo];
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unsigned int next_hi = (queue_lo + 1) % MAX_QUEUE;
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if (next_hi == queue_lo)
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{
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error("No space to queue audio packet\n");
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return;
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}
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queue_hi = next_hi;
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packet->s = *s;
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packet->tick = tick;
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packet->index = index;
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/* we steal the data buffer from s, give it a new one */
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s->data = malloc(s->size);
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if (!g_dsp_busy)
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wave_out_play();
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}
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void
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wave_out_play(void)
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{
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struct audio_packet *packet;
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ssize_t len;
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STREAM out;
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while (1)
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{
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if (queue_lo == queue_hi)
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{
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g_dsp_busy = 0;
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return;
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}
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packet = &packet_queue[queue_lo];
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out = &packet->s;
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len = write(g_dsp_fd, out->p, out->end-out->p);
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if (len == -1)
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{
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if (errno != EWOULDBLOCK)
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perror("write audio");
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g_dsp_busy = 1;
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return;
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}
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out->p += len;
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if (out->p == out->end)
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{
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rdpsnd_send_completion(packet->tick, packet->index);
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free(out->data);
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queue_lo = (queue_lo + 1) % MAX_QUEUE;
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}
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}
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}
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